反应 #2075732

反应方程式

6-Amino-5-bromo-2-(4-chloro-2-fluoro-3-methoxyphenyl)-pyrimidine-4-carboxylic acid

2,2,2-trifluoroethanol

cesium carbonate

→

title compound

收率 12.2%

6-Amino-2-(4-chloro-2-fluoro-3-methoxyphenyl)-5-(2,2,2-trifluoroethoxy)pyrimidine-4-carboxylic acid methyl ester

收率 12.2%

溶剂

water

DMF

反应条件

后处理

1. 1
   温度After cooling
2. 2
   萃取extracted twice with ethyl acetate
3. 3
   洗涤The combined extracts were washed twice with water
4. 4
   其他dried
5. 5
   其他evaporated
6. 6
   其他The residue was purified by flash chromatography on silica gel (5 to 20% ethyl acetate in hexane)
7. 7
   其他repurified by preparative HPLC (55% acetonitrile
8. 8
   workup.ADDITIONtreated with a 2 M solution of (trimethylsilyl)diazomethane in hexanes (1 mL)
9. 9
   其他The excess reagent was destroyed by addition of 0.5 mL acetic acid
10. 10
    其他the volatiles were removed by evaporation
11. 11
    洗涤washed with saturated sodium bicarbonate
12. 12
    洗涤washed with brine
13. 13
    其他dried
14. 14
    其他evaporated
15. 15
    其他the product was precipitated as a solid by slow addition of hexane

实验过程

6-Amino-5-bromo-2-(4-chloro-2-fluoro-3-methoxyphenyl)-pyrimidine-4-carboxylic acid (240 mg, 0.64 mmol), 2,2,2-trifluoroethanol (1.4 mL, 1.9 g, 1.9 mmol), cesium carbonate (1.0 g, 3.2 mmol) and cuprous bromide (92 mg, 0.64 mmol) were combined in 7 mL dry DMF and heated to 80° C. for 3 h. After cooling, the mixture was diluted with water and extracted twice with ethyl acetate. The combined extracts were washed twice with water, dried and evaporated. The residue was purified by flash chromatography on silica gel (5 to 20% ethyl acetate in hexane) and then repurified by preparative HPLC (55% acetonitrile buffered with 0.1% v/v acetic acid). The purified acid was taken up in 5 mL methanol, treated with a 2 M solution of (trimethylsilyl)diazomethane in hexanes (1 mL) and stirred for 30 m at 25° C. The excess reagent was destroyed by addition of 0.5 mL acetic acid and the volatiles were removed by evaporation. The residue was taken up in ethyl acetate, washed with saturated sodium bicarbonate, washed with brine, dried and evaporated. The residue was taken up in a small amount of dichloromethane and the product was precipitated as a solid by slow addition of hexane to give 32 mg of the title compound as a white solid: mp 123-125° C.: 1H NMR (CDCl3) δ 7.61 (dd, 1H), 7.20 (dd, 1H), 5.51 (br s, 2H), 4.51 (q, 1H), 4.01 (s, 3H), 3.99 (s, 3H).

来源